# Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 234
1. ## Algebra help please :)

Hey I was wondering if someone could help me with this. I know it's simple but It's for some reason harder for me. If someone can help me it will be really much appertiativ write an equation and solve tofind the solution to the following problem you have

asked by Hahahajokerqueen on September 1, 2016
2. ## Chemistry

You are given 75mL of 1mol/L NaOH and 75 mL of 1mol/L HNO3 at atmospheric pressure. After mixing the two compounds, he measured a rise in temperature from 25°C to 32°C. Find the change in energy of the system in kJ/mol. (Known: Density of aqueous

asked by John on May 26, 2015
3. ## Chemistry

A 35.0 mL sample of 0.150 M acetic acid is titrated with 0.150 M NaOH solution. Calculate the pH after the following volumes of base have been added: a) 0mL, b) 17.5 mL, c) 34.5 mL, d) 35 mL I've figured out a,b, and c. But at 35 mL the moles become equal

asked by Anonymous on October 28, 2010
4. ## Chemistry

Regular-strength chlorine bleach is a 5.25% solution of NaClO. how many milliliters of 0.02005 M sodium thiosulfate will be required to reach the equivalence point in the titration of a 1.000ml sample of Bleach by reacting the ClO- ions with I, then

asked by Jen on October 10, 2011
5. ## chemistry 30a

What volume (in mL) of an 8% w/v acetic acid solution would be needed to form 2.2 L of carbon dioxide gas at 25.2 degrees Celsius and 0.9982 atm? Assume the acid is reacted with excess sodium bicarbonate, and round your final answer to two sig figs.

asked by sara on March 12, 2012
6. ## Chemistry

0.05 L of chlorine gas is bubbled through 0.5 L of 2 M sodium Bromide solution. -What type of reaction is this ? A) Single Replacment B) Double Replacement C) Synthesis D) Decomposition E) Combustion - What product(s) will be predicted for this reaction?

asked by Courtany on November 12, 2014
7. ## Chem

A solution containing hydroxide ions will react with chlorine gas to produce chloride ions, gaseous oxygen, and water. Cl2(g) + 2e- → 2Cl-(aq) O2(g) + 2H2O(l) + 4e- → 4OH-(aq) Write a balanced net ionic equation for this reaction. I'm very lost

asked by Rose on June 14, 2018
8. ## chemistry

Use the table of complex ion formation constants to calculate the molar concentration of free Fe^2+ in 0.510M aqueous solution of potassium hexacyanoferrate(II) K4(Fe(CN)6) at 25 degrees celsius. I know the answer is 1.96*10^-6 m, but I'm at a loss on how

asked by Jacob on March 28, 2017
9. ## MATH

PLEASE HELP ME UNDERSTAND HOW I WAS TOLD TO USE 1.5 (BEING = TO 50%) * MY NUMBER TO ARRIVE AT THE ANSWER, I WAS PREVIOUSLY MULTIPLYING MY # BY 0.50 AND ACTUALLY ARRIVING AT THE SAME ANSWER AS ABOVE...BUT I JUST NOTICE IN SOME OF THE ANSWERS IN THE MATH

asked by EXTREMELY CONFUSED on October 26, 2013
10. ## Chemistry

20cm3 of 0.500moldm-3 H2SO4 was consumed to neutralize 50cm3 of 0.400moldm-3 NaOH. The temperature of the system is increased by 36 degree C. The heat capacity of the calorie meter was 39 JK-1, and the heat capacityof the solution is 4.2JK-1. Find the

asked by Emma on February 21, 2013
11. ## Chemistry 101

A solution containing 83.100 g of sodium hydroxide [molar mass = 40.0 g/mol] was neutralised using phosphoric acid. Calculate the moles of sodium phosphate formed (assuming that the reaction goes to completion). Give your answer to three significant

asked by Drew on October 13, 2014
12. ## National school

A dilute solution of sulfuric acid is added to 15g of copper and iron mixture. a) write the balanced equation for the occuring reaction. b) the volume of H2 evolved at standard conditions is 4.48L, what is the mass of each of the metals constituting the

asked by Maha on October 27, 2015
13. ## chemistry

The redox reaction: O3SOOSO3^2− + Cr^3+ -> HSO4^− + Cr2O7^2− is carried out in aqueous acidic solution. Which elements are undergoing changes in oxidation state? I thought it would be S and Cr. For the balanced equation, I got 3O3SOOSO3+Cr^3+ + 13H^+

asked by Eddy on March 23, 2011
14. ## Chemistry

Can u tell me the practical details of how you would prepare 0.5mol/dm3 hydrochloric acid solution from a stock of 34% (w/w) with a relative density of 1.18. Figure the number of moles per liter of the concentrate. Say is is 17 for example sake. You want a

asked by Kimoya Davy on April 13, 2007
15. ## HCA220

I answered several question for an assignment and I need help to understand how I got it wrong. The assignment dwelt medical terms. The following three were marked wrong. Please help! Use the word bank below to build the medical word that corresponds to

asked by Dan on November 30, 2009
16. ## chemistry

The reaction described by the equation Zn + Hg2Cl2 2Hg +Zn+2 + 2Cl is run on electrochemical cell. The E^0 of the cell at 25 degrees C is 1.03V. In the same cell, [Cl-]=.10 M and [Zn+2] is unknown, and the measured cell voltage is 1.21V. Compute the value

asked by Dylan on April 12, 2012
17. ## Geography

3. One of the main problems challenging the economics of many African nations today is a. a lack of diverse exports b. increasing their export of raw material c. competing with the industrial output of other African nations d. making fishing more

asked by mysterychicken on October 21, 2009
18. ## English

What is the correct punctuation for: The book had some nice features, such as: a hard-bound cover, a ribbon for a bookmark, and the author's signatures. How about "Among the nice book's features were a hard-bound cover, a ribbon bookmark, and the author's

asked by Lynne on July 20, 2007
19. ## Algebra

Write a system of equations to match each of these problems. Then solve the equations using the method... Substitution, or linear combinations. 1. Maria started her savings account with \$105. She adds \$10 to it each month, including the first month. Jana

asked by Devian on October 1, 2014
20. ## English

Thank you very much for your help. I still have problems with a few sentence. I hope you can have a look at them too. 1)Can't I switch from the present to the past if I want to refer to a historical event? 2) Do not use contracter forms when writing your

asked by Franco on May 25, 2010
21. ## Chemistry

Please help me with these problems, the book examples very different. I'm really confused. Any help with these will help me immensely. Thank you in advance! What I got were: 1.)c 2.)d 3.)a 4.)c 5.)b 1.) When is any endothermic reaction spontaneous? a.)When

asked by Herbert Lee on November 16, 2014
22. ## Chemistry

PRECIPITATION BY NaC2H3O2(aq) (a) Add 2 mL of sodium acetate solution to the test tube. (b) If a white precipitate forms at the bottom of the test tube, decant the remaining liquid into another clean test tube and retain the precipitate. (Decanting is the

asked by stacy on August 12, 2010
23. ## English

I forgot to include the following statements. Thank you very much!! 1)He fears that when Caesar will become (becomes) king he will turn into a dictator depriving the Romans of their liberty. 2)The ghost asks Hamlet to take revenge for his death (murder)

asked by Franco on February 21, 2010
24. ## Algebra

Why are variables useful in algebra? I feel the use of variables make it difficult for many people to understand because it is subconcious that math is numbers, not letters.... Thank you! By using a variable, one may make use of a formula which is good for

asked by russell on March 19, 2007
25. ## Guru Blue 1

Ok Guru I been working hard on this so lets see if this little engine here can handle all this text. Following if the system allows are all the questions accompanied by answers and notes of what I have so far. I will say the shortcut try was because

asked by Tony KC on February 25, 2009
26. ## Science

A 0.21g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration in mol1-1 in this solution and show successive steps in the calculation: If 0.21g in 0.25l then 0.84g

asked by Anthony on March 12, 2007
27. ## algebra "reiny"

how would you write an equation or inequality that could be used for analysis, prediction example gas prices? can some one explain to me how to write this i was going to do mine on diet how my sister last pounds on her diet she weight 410 lbs to begin with

asked by carla on April 16, 2007
28. ## aed 205

Read the following vignette and identify the factors that threaten the activity flow of the lesson. Once you have identified the problems, explain how you would avoid the problems if you were the teacher. Here is the story Mrs. P.waits while her

asked by scooby on April 25, 2010
29. ## finance

Question #28 The construction of abuilding costing \$12,0CI0,000 started i* Year I and was completed and occupied in Year 2 (two years constructions). \$8,000,000 of the construction costs was incurred in Year I and the halance in Year 2. Using the old rules

asked by Payal on August 8, 2016
30. ## Spanish

Our spanish class has been given a 1-minute speech to write up over the holidays, but our teacher hasn't provided us with any extra material we can use. I was wondering if you could give me sentence starters etc. to help me work on it. Here is the

asked by Nick on July 7, 2014
31. ## Bus law

In 1991 the Tailhook Association (mostly male military aviators) hosted their annual convention at the Las Vegas Hilton Hotel, despite the fact that they had known that during previous Tailhook conventions rowdy men in the hotel hallways had accosted young

asked by matt on March 24, 2007
32. ## AP US History

In the early 19th century, Americans sought to resolve their political disputes through compromise, yet by 1860 this no longer seemed possible. Analyze the reasons for this change. Im having problems finding information to support this. This is my

asked by Morgan on January 3, 2013
33. ## physics

please check these: A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How far from the mirror is the corresponding object? a. 20cm b. 15cm c. 7.5cm d. 5.0cm B A diffraction grating that contains 650

asked by physics on March 13, 2009
34. ## Geometry

1) find the coordinate of the image of point (1,2) translated left 2 units and reflected over the x -axis 2) Find the coordinate of the image of the point (2, -4) reflected over the x-axis 3) Determine the midpoint of the segment whose endpoints are A(7,

35. ## European history

Chose the correct answer and explain why: Malthus and Ricardo would both agree that a. One solution to poverty was to pay higher wages b. Poverty was inevitable c. Economic growth would end up in poverty in the long run d. capitalism is an evil system

asked by Kathleen on April 3, 2010
36. ## Chemistry

Why are the hydrogen bonds of a certain molecule weaker in solution (with water as a solvent) than in a vacuum? I'm supposed to have three reasons, and so far all I can come up with is that the water lowers the activation energy required to form the bond

asked by Sarah on December 14, 2017
37. ## calculus

Please help . confused here. The rate of change of an investment account earning continuous compound interest is given by dA/dt=kA where k is a positive constant. The initial account value was \$2500. At the end of the third year, the account value was

asked by mikey2 on March 11, 2013
38. ## AP Environmental Science

I'm confused about how to do these problems, I thought I was doing it right, but I think I might be wrong. The Honda Civic Hybrid is a compact car. It gets a combined highway and city fuel efficiency 17.8 kilometers per liter (42.0 miles per gallon).

asked by GG on January 25, 2017
39. ## math

I am a little lost on my homework can someone help me with these problems please! With a GM MasterCard, 5% of the amount charged is credited toward a rebate on the purchase of a new car. Express the R as a function of the amount charged A Write a formula

asked by Angel on July 4, 2005
40. ## com155

If I could get some help on the adverbs and adjectives in the following paragraph I wrote. I personally did not have any credit cards for a very long time. In the past I have had more then I needed and found them to just cause me problems. I was young and

asked by writing on August 2, 2011
41. ## math

In any triangle the sum of the measures of the angles is 180. In triangle ABC, A is three times as large as B and also 16 larger than C. Find the measures of each angle. I also would like to know how to solve these problems: In isosceles trapezoid ABCD,

asked by Faye on October 4, 2008
42. ## Algebra 2

1. Give 3 points that lie on the line 4x-y=6. 2. Give 3 points that lie on the line 3x+2y=6. 3. Give 3 points that lie on the line y= -4. Can someone please help because I have no clue how to do these problems

asked by Christian on September 18, 2007
43. ## Algebra 2

1. Give 3 points that lie on the line 4x-y=6. 2. Give 3 points that lie on the line 3x+2y=6. 3. Give 3 points that lie on the line y= -4. Can someone please help because I have no clue how to do these problems

asked by Christian on September 17, 2007
44. ## Algebra 2

1. Give 3 points that lie on the line 4x-y=6. 2. Give 3 points that lie on the line 3x+2y=6. 3. Give 3 points that lie on the line y= -4. Can someone please help because I have no clue how to do these problems.

asked by Christian on September 17, 2007
45. ## ap chemistry

How many moles of sodium acetate (NaCH3COO) must be added to 1.000 liter of a 0.500M solution of acetic acid (CH3COOH) to produce a pH of 5.027? The ionization constant of acetic acid is 1.8 × 10−5. Answer in units of mol

asked by gabriella on February 4, 2014
46. ## Chemistry

In an experiment, 95.0 mL of 0.225 M silver nitrate was mixed rapidly with 47.5 mL of 0.225 M calcium chloride in a coffee cup calorimeter. If a reaction occurred, was it exothermic or endothermic? If the reaction started at 23.7 °C, what is the final

asked by Nick on October 12, 2017
47. ## chemistry

a solid sample of impure Ba(OH02 is added to .4000L of .5000M of HBr. the remaining solution was acidic, it was then titrated to equivalence point with .1200L of .5000M NaOH. what mass of pure Ba(OH)2 was present in the sample?

asked by mel <3 on February 26, 2011
48. ## Chem-HELP

Can you please help me with these questions. I tried looking up information online and in my textbook but I could not find sufficient information to help me. 1. What is an aliquot of a sample? 2. What is the filtrate in a gravity procedure? 3. How full

asked by Zef on September 9, 2015
49. ## Chemistry

Calculate the number of grams of solid Mg(OH)2 that will dissolve in 650 mL of water. For Mg(OH)2, Ksp = 1.5 x 10-11. Assume no volume change for the solution when the solid is added. A. 0.0093 B. 0.0059 C. 0.012 D. 0.019 E. 0.060 I got 0.0059, but I'm not

asked by Jessica on December 26, 2012
50. ## ochem lab

What is the expected observed rotation of a 9.1 x 10-5 M solution of compound X? Note: compound X has a specific rotation of [α]D20 = -49o and a molecular weight of 235.2 g/mol. In addition, the path length of the cell used to take the polarimetry

asked by cn on April 2, 2012
51. ## Programming Logic

Programmign Logic for business Modify the PROCESS routine in Section 5.4 to determine whether the student is full time or part time before checking whether he or she lives in district or out of district. Use a flowchart and pseudocode to show your

asked by JEFF on September 19, 2011
52. ## Chemistry

A student titrated a solution containing 3.7066 grams of an unknown triprotic acid to the end point using 28.94 milliliters of 0.3021 M KOH. What is the molar mass of the unknown acid? And write a balanced equation for the reaction.

asked by Cassie on March 26, 2011
53. ## Chemistry

(a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 Celsius. (b) Classify each of the following compounds as either "acidic", "basic", or "amphoteric" (able to act as

asked by Chemgam on January 11, 2013
54. ## chemistry...

thanks for the last help, i got the right answer!! i got this wrong... (answer is supposed to be 0.165 but i put 0.0652) A sample of Na2CO3 weighing 0.2863 g is dissolved in 50 mL of water and an endpoint is reached when 32.83 mL of HClO4 has been added.

asked by mark on November 16, 2007
55. ## chem

Sulfuric acid reacts with sodium hydroxide according to this equation: H2S04 + 2 NaOH Na2(SO4) + 2 H2O A 10.00 mL sample of the H2SO4 solution required 13.71 mL of 0.309 M NaOH for neutralization. Calculate the molarity of the acid.

asked by Liang9506 on November 21, 2012
56. ## Chemistry

Can someone please help me out here? I've tried several times and i keep getting the wrong answer :( lol A small crucible is filled with 100.00 mL of n-hexadecane (MW (226.44 g/mol), density (0.7703 g/mL)) and 2.10 L of 7-octenyltrichlorosilane (MW (245.65

asked by Tawnya on January 21, 2013
57. ## Algebra

A rectangular garden is 54 feet longer than it is wider. Its perimeter is 292 feet. Write a system of linear equations whose solution gives the width and length of the garden. Use the substitution method to solve and check your answer.

asked by Tracy on July 1, 2017
58. ## 2nd Order linear ODEs

I'm having trouble solving this problem: For the equation x^(2)y′′ - xy′ = 0 , find two solutions, show that they are linearly independent and find the general solution. Hint: Try y = x^(r). I divided the equation by x^(2) first to simplify it, and

asked by Student on January 30, 2014
59. ## General Mathemtics

Our topic is about Annuity.An investment firm offers a 10-year,simply annuity with a guaranted rate of 6.85% compounded annually.How much should you pay so as to receive payments of 25,0000 pesos annually over the 10 period? PLEASE show your solution.

asked by Synthia on September 30, 2018
60. ## chemistry

A student adds .137 grams of nickel(II) hydroxide powder to 10.0 L of distilled water at 25C with vigorous stirring. Did all of the powder dissolve? If not, how much powder remains undissolved? If so, how much more powder can be dissolved before a

asked by Tyler on July 17, 2011
61. ## Gen Chemistry

What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second equilibrium depends upon the amount of [H+] already donated by

asked by lyne on March 26, 2008
62. ## chemistry

Write the balanced molecular, complete ionic, and net ionic equations for the following reactions in aqueous solution: a. magnesium chloride reacts with potassium carbonate b. sulfuric acid reacts with sodium hydroxide

asked by gold on October 13, 2011
63. ## Chemsitry II

50.00 mL of 1.0 M HCl and 50.00 mL of 1.0 M NaOH are mixed. The temperature is observed to increase by 10.0 degrees C. How much energy (in J) was absorbed by the calorimeter? Assume a density of the reaction mixture of 1 g/mL. Specific heat of the solution

asked by Sarah on May 31, 2011
64. ## gr9 science

For an average snowfall the density of the snow could be 0.6 g/cm3. For a 15 cm snowfall what mass of snow would you shovel from a driveway 10m long and 3m wide? could you show me the steps using the format GRASS?

asked by beccaa on September 23, 2009
65. ## Chemistry105

When 50.0 Ml of 1.00 m chi was mixed with 50.0 ml of 1.00 m NaOH in a calorimeter the temperature rose from 25.0 c to 32.0 c calculate the heat change for the reaction assuming that the total volume of the solution is 100.0 ml and the specific heat is 1.00

asked by Mira on December 2, 2012
66. ## Chemistry

3) A student dissolves a 1.18g aspirin tablet in water and titrates the solution with a .265M NaOH. 22.05mL of NaOH are required to reach the equivalence point. Calculate the percentage of acetylsalicylic acid in the tablet.

asked by Juliet on October 25, 2010
67. ## Chemistry105

When 50.0 Ml of 1.00 m chi was mixed with 50.0 ml of 1.00 m NaOH in a calorimeter the temperature rose from 25.0 c to 32.0 c calculate the heat change for the reaction assuming that the total volume of the solution is 100.0 ml and the specific heat is 1.00

asked by Mira on December 2, 2012
68. ## Calculus

A man 5.5 ft tall walks away from a lamp post 10 ft high at the rate of 8 ft/s. (a) How fast does his shadow lengthen? (b) How fast does the tip of the shadow move? Can you please tell me what method/s you used to come up with a solution? I wasn't sure

asked by Jean on August 12, 2015
69. ## AP Chemistry

What acid and what strong base would react in aqueous solution to produce the following salts in the formula equation? Write the balanced formula equation for each reaction. a. potassium perchlorate b. cesium nitrate c. calcium iodide

asked by Angel on November 8, 2009
70. ## chemistry

In an experiment, 95.0 mL of 0.225 M silver nitrate was mixed rapidly with 47.5 mL of 0.225 M calcium chloride in a coffee cup calorimeter. If a reaction occurred, was it exothermic or endothermic? If the reaction started at 23.7 °C, what is the final

asked by - on April 22, 2016
71. ## chemistry

The solubility of cholesterol in 95% ethanol is 32.5 mg/mL at 37°C and 11.5 mg/mL at 7°C. How much 95% ethanol is required to dissolve 1 g of cholesterol at 37°C? If that volume of warm, saturated solution is cooled in a refrigerator to 7°C, how much

asked by lisa on September 28, 2009
72. ## Math- Reiny can you help me with this question

I know how to do the work, but the way the question is worded I am not sure the answer. The math works comes out to -2 which is b but if you want the number less than -2 the answer is c. Which are they asking for . This is my work. Which is the value is in

asked by b6 on January 4, 2013

you need to make 20ml of a 20% glucose solution. I need to calculate the amount of glucose and water needed. I know that the M.W is 180.16 for glucose. Would I multiply 20ml times 20 percent first? Thank you!

asked by Anonymous on March 26, 2013
74. ## Chemistry

Calculate solubility of AgCl (in g/L) in a 6.5*10^-3 M silver Nitrate solution ksp= 1.8 * 10^-10 (AgCl molecular mass is 143.3g) any idea on how to do this this is what i tried> AgCl--> Ag + Cl I 6.5*10^-3 0 C same x E same x ksp = [Ag][Cl] (1.8 * 10^-10)

asked by Steve on February 18, 2016
75. ## Science

10 g of acetic acid are combined with 5 g of sodium bicarbonate in a beaker with a mass of 25 g. After the reaction, the mass of the beaker with the new solution was only 39 g. How ould this change in mass be explained?

asked by Anonymous on May 26, 2013
76. ## Chemistry

Calculate solubility of AgCl (in g/L) in a 6.5*10^-3 M silver Nitrate solution ksp= 1.8 * 10^-10 (AgCl molecular mass is 143.3g) any idea on how to do this this is what i tried> AgCl--> Ag + Cl I 6.5*10^-3 0 C same x E same x ksp = [Ag][Cl] (1.8 * 10^-10)

asked by Steve on February 18, 2016
77. ## math11

Solve the non linear equation x^2=3x+4 graphically using a calculator, Write the equations of the graphs you used to find the solution. I got this question wrong what would be my Y1= and Y2= equations. Not sure what I'm doing wrong but whenever I have an

asked by Juliet on October 19, 2010
78. ## math11

Solve the non linear equation x^2=3x+4 graphically using a calculator, Write the equations of the graphs you used to find the solution. I got this question wrong what would be my Y1= and Y2= equations. Not sure what I'm doing wrong but whenever I have an

asked by Juliet on October 19, 2010
79. ## Chemistry

0.255 g sample of H2C2O4 required 25.70 mL of NaOH to neutralize, what would you report as the molarity of NaOH solution? the reaction is as follows: H2C2O4(aq) +2 NaOH (aq) -> Na2C2O4(aq) +2 HOH (l)

asked by Vinny on June 7, 2011
80. ## chemistry

A solution of ethanol, C2H5OH, is prepared by dissolving 25.0 mL of ethanol in enough water to give a total volume of 250.0 mL. What is the percent-by-volume concentration of ethanol?

81. ## Chemistry

To prepare a 400 mL solution of .7500 M NaC2H3O2, how many grams of NaC2H3O2 would be needed? I am wondering if I set this up, I got an answer of .0435 g NaC2H3O2. But i'm not sure if that is right? Is that the correct answer?

asked by becs on July 17, 2011
82. ## chemistry

How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.75 to 9.01? Assume a negligible volume change. ……….x 10………Moles of ……………………..h3O+ or OH- I got 4.6001 x 10-5 M of h3o+...but it was

asked by patrick on October 4, 2015
83. ## Chemistry

To neutralize a solution of NaOH and use the least volume of acid, you should select I. 1.0M HCl II. 1.0 M HC(2)H(3)O(2) III. 1.0 M H(2)SO(4) (A) I only (B) II only (C) III only (D) I and II use equal and lesser volumes. (E) I, II, and III use the same

asked by Dom on April 29, 2008
84. ## math

each side of equilateral triangle is 5 cm shorter than the side of square. the sum of the perimeters of the two figures is 251 cm. how long is each side of the triangle? solution pls.

asked by Seohyun on January 13, 2015
85. ## Chemistry

What is the percent by mass of glucose in a solution containing 0.15 moles of glucose dissolved in 410g acetic acid? The molar mass of glucose is 180g/mol

asked by Lauren smith on December 15, 2010
86. ## HELPP !!

Copper(I) ions in aqueous solution react with NH3 according to Cu^+ + 2NH3 --> Cu(NH3)2^+ Kf=6.3x10^10 Calculate the solubility (in g/L) of CuBr (Ksp=6.3x10^-9) in 0.81 M NH3.

asked by HELPP ! on May 10, 2012
87. ## Chemistry

When hypochlorite ions act as an oxidizing agent, hydroxide ions are formed. What will this do to iron (II) or to iron (III) ions? Both Fe(OH)2 and Fe(OH)3 are insoluble in an aqueous solution.

asked by Raj on March 20, 2007
88. ## chemistry

a titration is done with with 25.00 mL of a .1500 M HBrO solution is titrated with .1025 M NaOH. Ka for HBrO= 2.0 x10^-9. The pH of HBrO before the titration begins is approx. closest to which of the following a. 0.82 b. 4.76 c. 8.70 d 10.60 e. 13.01 the

asked by anon on October 11, 2010
89. ## Algebra

Please I need some help for this problem below please show the full solution thanks:Two angles of a triangle have the same measure and the third one is 51 degrees greater than the measure of each of the other two. Find the measure of the LARGEST angle in

asked by Arie on January 27, 2016
90. ## Chemistry

Calculate the molar concentration of uncomplexed Zn2+ (aq) in a solution that contains 0.22 mol of Zn(NH3)4 2+ per liter and 0.3109 M NH3 at equilibrium. Kf for Zn(NH3)4 2+ is 2.9 X 10^9 I started this way... (0.3109 + 4)2/0.22-x)= 2.9 X 10^9

asked by Felix on March 18, 2013
91. ## chemistry

Im really sorry I got sidetracked:P This is the question I wanted to ask you In a saturated solution of silver sulfite, the concentration of silver ion is 3.6 x 10^-4 mol/L. The Ksp of silver sulfite willl be what? Sorry about that

asked by MikeSo on April 4, 2008
92. ## chemistry

How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.75 to 9.01? Assume a negligible volume change. ……….x 10………Moles of ……………………..h3O+ or OH- I got 4.6001 x 10-5 M of h3o+...but it was

asked by patrick on October 4, 2015
93. ## college chemistry

To dilute a solution from 0.600 M to 0.100 M, the final volume must be A. 1/6 the original volume. B. 0.7 L. C. More information is needed to answer this question. D. 6 times the original volume. E. 60 L.

asked by Jake on November 18, 2010
94. ## Chemistry/Electrochem

Consider a cell at 299K: line notation Fe-Fe2+(1.39)--Cd2+(2.35)-Cd Given the overall standard reduction potential of the cell is -0.038. What will the concentration of the Cd2+ solution be when the cell is dead?

asked by Andres on October 1, 2012
95. ## Chemistry

If a solution of Ca(OH)2 has a pH of 12.31 how can I calculate the concentration of calcium hydroxide in mol L-1 ? Write the dissociation equation: Ca(OH)2 >>Ca+ + 2OH So the concentration of the OH ion is twice the Ca(OH)2 . Find the concentration of the

asked by Fiona on May 21, 2007
96. ## General Chemistry

A 0.179 g sample of a vitamin C tablet was titrated with 0.1000 M NaOH according to the procedure in this experiment. The titration required 7.08 mL of NaOH solution. How many moles of NaOH were used in the titration?

asked by Alex on October 14, 2015
97. ## Chemistry

A solution contains .370 mol of isopropanol (C3H7OH) dissolved in 1.700 mol of water. What is the mass percent of isopropanol? What is the molality of isopropanol? i've done it a couple times now and i must have something off

asked by Luke on October 18, 2010
98. ## chemisty

600 mL of an unknown monoprotic acid was titrated with a standard solution of a 1.0 M base. If it took 40.0 mL of the base to neutralize the acid, what was the H+ ion concentration of the acid in moles per Liter?

asked by ana on December 14, 2010
99. ## Chemisty

The solubility of sodium floride, NaF, is 4.06 g NaF/100 g H2O at 20ºC. What mass of NaF would you have to dissolve in 1000 g H2O to make a saturated solution?

asked by Yvette on July 8, 2010
100. ## Chemistry

At 25 °C, an aqueous solution has an equilibrium concentration of 0.00147 M for a generic cation, A (aq), and 0.000735 M for a generic anion, B2–(aq). What is the equilibrium constant, Ksp, of the generic salt A2B(s)?

asked by Jordan on May 6, 2016